diff --git a/django/db/models/fields/related.py b/django/db/models/fields/related.py
index 8070457088..319b23c468 100644
--- a/django/db/models/fields/related.py
+++ b/django/db/models/fields/related.py
@@ -239,7 +239,7 @@ class RelatedField(FieldCacheMixin, Field):
             if not rel_is_hidden and clash_field.name == rel_name:
                 errors.append(
                     checks.Error(
-                        "Reverse accessor for '%s' clashes with field name '%s'." % (field_name, clash_name),
+                        "Reverse accessor for '%s' clashes with field name '%s' (clashing name: '%s')." % (field_name, clash_name, clash_name),
                         hint=("Rename field '%s', or add/change a related_name "
                               "argument to the definition for field '%s'.") % (clash_name, field_name),
                         obj=self,
@@ -250,7 +250,7 @@ class RelatedField(FieldCacheMixin, Field):
             if clash_field.name == rel_query_name:
                 errors.append(
                     checks.Error(
-                        "Reverse query name for '%s' clashes with field name '%s'." % (field_name, clash_name),
+                        "Reverse query name for '%s' clashes with field name '%s' (clashing name: '%s')." % (field_name, clash_name, clash_name),
                         hint=("Rename field '%s', or add/change a related_name "
                               "argument to the definition for field '%s'.") % (clash_name, field_name),
                         obj=self,
@@ -271,7 +271,7 @@ class RelatedField(FieldCacheMixin, Field):
             if not rel_is_hidden and clash_field.get_accessor_name() == rel_name:
                 errors.append(
                     checks.Error(
-                        "Reverse accessor for '%s' clashes with reverse accessor for '%s'." % (field_name, clash_name),
+                        "Reverse accessor for '%s' clashes with reverse accessor for '%s' (clashing name: '%s')." % (field_name, clash_name, clash_name),
                         hint=("Add or change a related_name argument "
                               "to the definition for '%s' or '%s'.") % (field_name, clash_name),
                         obj=self,
@@ -282,8 +282,8 @@ class RelatedField(FieldCacheMixin, Field):
             if clash_field.get_accessor_name() == rel_query_name:
                 errors.append(
                     checks.Error(
-                        "Reverse query name for '%s' clashes with reverse query name for '%s'."
-                        % (field_name, clash_name),
+                        "Reverse query name for '%s' clashes with reverse query name for '%s' (clashing name: '%s')."
+                        % (field_name, clash_name, clash_name),
                         hint=("Add or change a related_name argument "
                               "to the definition for '%s' or '%s'.") % (field_name, clash_name),
                         obj=self,
